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Note Employee benefits (Funded Status of the Plan) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at end of year | $ 685,823 | $ 767,539 |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at end of year | (754,558) | (816,988) | $ (778,658)
Fair value of plan assets at end of year | 685,823 | 767,539 | 697,129
Funded status at year end | (68,735) | (49,449) | (81,529)
OPEB Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at end of year | (153,415) | (170,720) | (162,365)
Fair value of plan assets at end of year | 0 | 0 | 0
Funded status at year end | $ (153,415) | $ (170,720) | $ (162,365)

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